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    <meta charset="UTF-8">
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    <title>Document</title>
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<script>
    /**
     *匿名函数 
     * 
     * 特殊的 事件触发函数（我没写）
     */
    (function(userName){
        alert("b人 " + userName);
    })("李小胖");


    var add = function(a,b){
        return a + b;
    };
    var sum = add(1,2);
    console.log(sum);
</script>
</html>